// SPDX-License-Identifier: LGPL-3.0-or-later
// Author: Kristian Lytje

#pragma once

#include <rigidbody/selection/BodySelectStrategy.h>

namespace ausaxs::rigidbody {
	namespace selection {
		/**
		 * @brief Sequential body selection strategy.
		 * 
		 * This selection strategy selects the bodies sequentially, including all the constraints of each body.
		 * Example: If we have the bodies A(3), B(2), C(2) where A has 3 constraints, B has 2 constraints and C has 2 constraints,
		 * 		the order of selection would be A1, A2, A3, B1, B2, C1, C2.
		 * 
		 * Note that this strategy will throw an exception if a body has no constraints.
		 */
		class SequentialConstraintSelect : public BodySelectStrategy {
			public: 
				SequentialConstraintSelect(observer_ptr<const Rigidbody> rigidbody);
				~SequentialConstraintSelect() override;

				std::pair<unsigned int, int> next() override; ///< @copydoc BodySelectStrategy::next()

			private:
				unsigned int ibody = 0; 		// The index of the body to be transformed. 
				unsigned int iconstraint = 0; 	// The index of the constraint to be transformed.
		};	
	}
}